Siemens SIMATIC S7-300 Reference Manual page 42

Basic instructions
Alarms
✔
Generate program alarm with associated values
✔
Get alarm status
✔
Generate user diagnostics alarm that will be
entered in the diagnostics buffer.
✔ ✔
Generate alarm message
✔ ✔
Generate alarm message with acknowledgment
✔ ✔
Create permanently acknowledged PLC alarms
D stands for Diagnostics (can be diagnosed) or
also for Delete (deletable)
✔ ✔
Create acknowledgeable PLC alarms
D stands for Diagnostics (can be diagnosed) or
also for Delete (deletable)
✔ ✔
Determine the acknowledgment status of the last
ALARM_SQ incoming alarm
S stands for short and C for check
✔ ✔
Write a user diagnostics event to the diagnostics
buffer
Write user message
A5E33285102-AB
Extended instructions
Description
Technology
LAD / FBD
(not S7-1200)
Program_Alarm
Get_AlarmState
Gen_UsrMsg
ALARM_S
ALARM_SQ
ALARM_D
ALARM_DQ
ALARM_SC
WR_USMSG
Communication
STL
SCL
Page 41